Question

the average of 6 members is 30. if the average of first-floor is 25 then the fourth number is?​

Answer 1

Answer:

kya pata mai toh point ke liyeh time pass kar raha hu

Answer 2

Answer:

Step-by-step explanation:

18

Proof:

a,b,c,d are 4 numbers. d is the fourth in the series.

Given

(a+b+c+d)/4=24

(a+b+c+d)=24*4

(a+b+c+d)=96 (i)

Given

(a+b+c)/3=26

(a+b+c)=26*3

(a+b+c)=78 (ii)

Now,

(ii) -> (i)

(78 + d) = 96

d = 96 - 78

d=18

Since d is the fourth number in the series, the fourth number is 18.

QED.